Question

200 l/s 150 l/s [30 Marks] Question 3 3.1 A sewer pipe flowing full has an average slope of 0.3%, internal diameter of 272.2 mm and Manning's roughness co-efficient of 0.012. Determine the ADF and by adopting a 3.2 peak factor, calculate the peak daily flow and peak wet weather flow respectively in litres per second (l/s) (10) 3.2 Differentiate between: (15) • Domestic Sewage. Industrial Sewage and Sanitary Sewage • Combined and separate sewage system • Sewage and storm drainage system [25Marks]

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Answer 1

briven allemagn slope s = 0.3% loo diameter D = 272.2 mm 2.72.2*10-31 roughness Coefficient manning's Ma 0.012 To find Average daily frow (Aof) and Peak How from in allenage How Cara is given manning equation Clarga 1 AX (RJ) (Sarg) " A- Aree - Area r Sewer sewer where - tutar K 672-2 *163) R= hydraulic rading of = Area of sewer 1. Perimeter of sewer sewer a My DZ o

Savy: ayeringe Slopa 1. So, Carga I XAX(/4) ? x (Sars) "? [ 222.24103 0.012 272.2 x 16 A - - t t + 272.2+10.1677 20.05477 0.012 T - X166 = d.ony milsec con X103 Elsea Cang = 44 L/see] average low Qars: 44 H see and Peak daily flow Opeak a peak fretor of larg - 3.2 of uy peak loob Lisee] A or Clarsa uullsea 1. - 44 X 86400 l/day

Ganga 3.80 x 10 ilder Toang - 3.80 mLol factor Opeak a clarst feat = 3.80*3.2 Topeak = 12.16 MLDT Carga uy Ll see @ars = 3.60 MLD A peak a 140.8 elsea peap = 12.16 MLD 2 Domestic Sewage - - domestic domestic mixture of liquid waste activities like sewage water in generated kitchen, bathroom due is to called Industrial sewage mixture of water in e liquid waste generated due to industrial activitig is called industrial Sewage Samitory Sewase combined domestic Sewase and industrial sewage is taken together is called Sanitary sewage.

& Combined and seperate sewage system Combined sewage system S Storm water is Same pipe line in combined sewage system sewage and carried out in the Seperate sewage system S Stormy water is Pipe line in system Caried seperate sewage out in sewage and different ♡ drainage system Sewage and storly sewage - the the form Sewage All the waste generated from domestic and industrial Process in of liquidated State is known as from Storm - It is sum off that is all the roads, building and Catenment area is teemed as coming ofner Storm: